CN111455254A - Low-cost easy-processing iron-nickel-cobalt-based high-temperature alloy and preparation method thereof - Google Patents
Low-cost easy-processing iron-nickel-cobalt-based high-temperature alloy and preparation method thereof Download PDFInfo
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- 239000000956 alloy Substances 0.000 title claims abstract description 90
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 89
- 238000012545 processing Methods 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title claims abstract description 7
- KGWWEXORQXHJJQ-UHFFFAOYSA-N [Fe].[Co].[Ni] Chemical compound [Fe].[Co].[Ni] KGWWEXORQXHJJQ-UHFFFAOYSA-N 0.000 title claims description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 47
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 13
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 13
- 229910052742 iron Inorganic materials 0.000 claims abstract description 12
- 238000005098 hot rolling Methods 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims description 30
- 238000005096 rolling process Methods 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 15
- 101000912561 Bos taurus Fibrinogen gamma-B chain Proteins 0.000 claims description 11
- 239000010963 304 stainless steel Substances 0.000 claims description 9
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 claims description 9
- 238000004321 preservation Methods 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 4
- 238000005260 corrosion Methods 0.000 abstract description 18
- 230000007797 corrosion Effects 0.000 abstract description 18
- 230000005496 eutectics Effects 0.000 abstract description 10
- 230000003647 oxidation Effects 0.000 abstract description 4
- 238000007254 oxidation reaction Methods 0.000 abstract description 4
- 229910017709 Ni Co Inorganic materials 0.000 abstract description 3
- 229910003267 Ni-Co Inorganic materials 0.000 abstract description 3
- 229910003262 Ni‐Co Inorganic materials 0.000 abstract description 3
- 238000003723 Smelting Methods 0.000 abstract description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 15
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- 239000010959 steel Substances 0.000 description 9
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- 229910052726 zirconium Inorganic materials 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- 238000001556 precipitation Methods 0.000 description 5
- 229910000859 α-Fe Inorganic materials 0.000 description 5
- 229910001566 austenite Inorganic materials 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 4
- 238000000265 homogenisation Methods 0.000 description 4
- 238000010248 power generation Methods 0.000 description 4
- 229910000601 superalloy Inorganic materials 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 description 3
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- 235000019786 weight gain Nutrition 0.000 description 3
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- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
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- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
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- C22C30/00—Alloys containing less than 50% by weight of each constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
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Abstract
A low-cost easy-processing Fe-Ni-Co-based high-temperature alloy and a preparation method thereof comprise the following components in percentage by mass: 16-20%, Fe: 15-20%, Co: 15-23%, Ti: 4.5-5.6%, Al: 2.1-3.0%, W: 1.0-3.0%, Mo: 1.0-3.0%, Si: less than or equal to 0.5 percent, Mn: less than or equal to 0.5 percent, C: 0.04-0.07%, B: less than or equal to 0.03 percent, Zr: less than or equal to 0.03 percent, and the balance being Ni; homogenizing after smelting, hot rolling and finally heat treatment. According to the invention, the Al and Ti elements are added to promote the gamma' phase to be precipitated, so that the alloy strength can be improved, and meanwhile, the eutectic region at the grain boundary provides further guarantee for the strength performance of the alloy. Finally, the novel high-temperature alloy with good high-temperature strength, corrosion/oxidation resistance, high-temperature structure stability and good processing performance is obtained.
Description
Technical Field
The invention belongs to the field of high-temperature alloys, and particularly relates to a low-cost easily-processed iron-nickel-cobalt-based high-temperature alloy and a preparation method thereof, which are particularly suitable for high-temperature key components of main steam pipelines, headers, rotors and blades of thermal power advanced ultra-supercritical units.
Background
With the increasing demand of electricity in China, the problems of energy shortage and environmental pollution are increasingly highlighted, and the demand for developing efficient, energy-saving and environment-friendly power generation modes is more urgent. Thermal power generation is the most important power generation technology in China for a long time, and the improvement of steam parameters of a unit is considered to be the most effective way for solving the problems. A great deal of past practice shows that the service performance of key component materials is the most main reason for restricting the improvement of steam parameters of a boiler unit, and as one of the key components with the severest service working conditions in the boiler of the thermal power unit, the service performance of the materials is greatly required by large-caliber thick-wall pipes such as a main steam pipe, a header and the like. With the great improvement of main steam parameters of the thermal power generating unit, the development of high-temperature alloy materials which can meet the performance requirements of large-caliber thick-wall pipes of 700 ℃ grade units and have excellent processability becomes a problem to be solved urgently in the thermal power generation industry.
At present, thermal power generating unit large-caliber thick-wall pipes below 600 ℃ grade at home and abroad are mainly made of ferrite heat-resistant steel (Cr: 9-12 wt.%) and austenite heat-resistant steel. The common ferrite heat-resistant steel mainly comprises TP91, NF616, E911, HCM12A and the like, and the materials have excellent durability and corrosion resistance, so the ferrite heat-resistant steel is widely applied to large-caliber thick-wall pipes of units below 600 ℃. The TP91 is completely made into a home, is widely applied to subcritical and supercritical thermal power generating units in China, and has accumulated a large amount of service performance data. The data and practice show that the ferrite heat-resistant steel is difficult to meet the service performance requirement of higher temperature parameters on the performance of the large-caliber thick-wall pipe material. Compared with ferrite heat-resistant steel, austenite heat-resistant steel such as coarse crystal (TP304H, TP347H), fine crystal (Super304H, TP347HFG) and high chromium (HR3C, NF709, SAVE25) has more excellent endurance strength, oxidation resistance, corrosion resistance and the like. However, it also has problems of low heat transfer efficiency, high thermal expansion coefficient, high cost, etc. during the application process. Especially, when the temperature of main steam reaches above 700 ℃, the strength of the austenitic heat-resistant steel can not meet the requirement of the large-caliber thick-wall pipe on the service performance of the material.
Aiming at the requirement of a 700 ℃ grade ultra supercritical unit boiler large-caliber thick-wall pipe on the use performance of the material, a series of nickel-based wrought superalloy materials are developed abroad currently, such as Inconel740H developed by American special metal company, Haynes282 developed by American Hull company, CCA617 developed by Detison Krupp company, Nimonic263 developed by Rolls-Royce company in the UK, USC41 developed by Nihiti company and the like. The materials have excellent high-temperature endurance strength and oxidation resistance, but are expensive, poor in welding performance, high in technical requirements for smelting, hot working and the like, and limit rapid popularization and application of the materials. Further, Nippon Sumitomo corporation has developed iron-nickel-based superalloys such as HR6W and HR 35; sanicro25 Ferro-Nickel-based alloys were developed by Shantevick, Sweden; the Shenyang metal institute and the Steel research institute of Chinese academy of sciences also develop the iron-nickel base wrought high-temperature alloys such as GH2984 and GH110 respectively. Compared with the nickel-based wrought superalloy, the iron-nickel-based superalloys have the advantages of low raw material cost, low thermal strength and poor structural stability and corrosion resistance. Meanwhile, as deformation processing is still needed to obtain the tissues and the performances required by service, the preparation and processing processes are complex, so that the overall manufacturing cost is higher, and the difficulty in further improving the performances is higher.
Disclosure of Invention
The invention aims to develop a low-cost easy-processing iron-nickel-cobalt-based high-temperature alloy.
In order to achieve the above purpose, the invention adopts the technical scheme that:
a low-cost easy-processing Fe-Ni-Co-based high-temperature alloy comprises the following components in percentage by mass: cr: 16-20%, Fe: 15-20%, Co: 15-23%, Ti: 4.5-5.6%, Al: 2.1-3.0%, W: 1.0-3.0%, Mo: 1.0-3.0%, Si: less than or equal to 0.5 percent, Mn: less than or equal to 0.5 percent, C: 0.04-0.07%, B: less than or equal to 0.03 percent, Zr: less than or equal to 0.03 percent, and the balance being Ni.
A preparation method of a low-cost and easy-processing Fe-Ni-Co-based high-temperature alloy comprises the following steps of: 16-20%, Fe: 15-20%, Co: 15-23%, Ti: 4.5-5.6%, Al: 2.1-3.0%, W: 1.0-3.0%, Mo: 1.0-3.0%, Si: less than or equal to 0.5 percent, Mn: less than or equal to 0.5 percent, C: 0.04-0.07%, B: less than or equal to 0.03 percent, Zr: less than or equal to 0.03 percent, and the balance being Ni; keeping the temperature at 1050 ℃ of 950-.
The invention further improves the following steps: the temperature is raised to 950 ℃ and 1050 ℃ at the speed of 10-20 ℃/min.
The invention further improves the following steps: and after each pass of rolling is finished, returning to the furnace and preserving heat for 10-20 min.
The invention further improves the following steps: the high-temperature hot rolling is carried out in a sheathing mode, and the sheathing material is a 304 stainless steel sheet with the thickness of 0.5-1.0 mm.
The invention further improves the following steps: the specific process of the heat treatment is as follows: heating to 30-70 deg.C above the gamma' dissolving temperature at a rate of 50-90 deg.C/min for 3.0-5.0 hr, and air cooling to room temperature; then heating the alloy to the temperature of 300-350 ℃ below the gamma 'dissolving temperature, then carrying out air cooling after the heat preservation is carried out for 3-9 hours, and finally heating to the temperature of 200-250 ℃ below the gamma' dissolving temperature, then carrying out air cooling after the heat preservation is carried out for 1-3 hours. Compared with the prior art, the invention has the following beneficial effects:
the invention guarantees the good high-temperature strength and corrosion resistance of the alloy and also considers the processing and forming performance of the alloy. The structural stability of the alloy is controlled on the basis of greatly improving the content of Fe element in the alloy, and simultaneously, the content and proportion of corrosion resistant elements such as Al, Cr and the like are reasonably adjusted to obtain good corrosion resistance. However, the higher Fe content generally affects the strength performance of the alloy, the invention can improve the strength of the alloy by adding Al and Ti elements to promote the precipitation of gamma' -phase, and meanwhile, the eutectic region at the grain boundary also provides further guarantee for the strength performance of the alloy. Finally, the novel high-temperature alloy with good high-temperature strength, corrosion/oxidation resistance, high-temperature structure stability and good processing performance is obtained.
Furthermore, in order to avoid the problems that the separation of a gamma' phase is promoted by overlarge temperature reduction amplitude before the alloy rolling process, an alloy ingot is cracked due to transverse shear stress in the rolling process and the like, the high-temperature hot rolling is carried out in a sheathing mode, and a sheathing material is a 304 stainless steel sheet with the thickness of 0.5-1.0 mm.
Drawings
FIG. 1 is a photograph of the tissue of example 1;
FIG. 2 is the morphology of the intergranular eutectic region of example 2;
FIG. 3 shows the grain boundary morphology of comparative example 1.
Detailed Description
The present invention will be described in further detail with reference to examples.
The invention designs a low-cost easy-processing iron-nickel-cobalt-based high-temperature alloy, which comprises the following components in percentage by mass: cr: 16-20%, Fe: 15-20%, Co: 15-23%, Ti: 4.5-5.6%, Al: 2.1-3.0%, W: 1.0-3.0%, Mo: 1.0-3.0%, Si: less than or equal to 0.5 percent, Mn: less than or equal to 0.5 percent, C: 0.04-0.07%, B: less than or equal to 0.03 percent, Zr: less than or equal to 0.03 percent, and the balance being Ni. Heating the alloy to 950-1050 ℃ at the speed of 10-20 ℃/min, preserving the heat for 0.5-1.0 h, then continuing to heat and carrying out homogenization treatment at 1150-1180 ℃ for 24-72 h.
High-temperature rolling is carried out at the temperature 50-100 ℃ above the gamma' dissolving temperature, the deformation of each pass is 10-15%, the alloy is returned to the furnace and kept for 10-20min after the rolling is finished, and the final total deformation of the alloy is not lower than 50%. In order to avoid the problems that the gamma' phase precipitation is promoted by overlarge temperature reduction amplitude before the alloy rolling process, the alloy ingot is cracked due to transverse shear stress in the rolling process and the like, the high-temperature hot rolling is carried out in a sheathing mode, and the sheathing material is a 304 stainless steel sheet with the thickness of 0.5-1.0 mm.
Heating the rolled alloy to a temperature higher than the gamma' dissolution temperature by 50-90 ℃/min and within a range of 30-70 ℃, preserving the heat for 3.0-5.0 hours, and cooling the alloy to room temperature in air after the heat preservation is finished; then heating the alloy to the temperature of 300-350 ℃ below the gamma 'dissolving temperature, then carrying out air cooling after the heat preservation is carried out for 3-9 hours, and finally heating to the temperature of 200-250 ℃ below the gamma' dissolving temperature, then carrying out air cooling after the heat preservation is carried out for 1-3 hours.
Alloy with austenite and Ni in crystal3Al (gamma ') two-phase composition, wherein the volume fraction of gamma' is not less than 25%. The grain boundary is composed of M23C6 and gamma/gamma' eutectic region. The alloy has excellent strength, the tensile yield strength of the alloy in an as-cast state at room temperature, 800 ℃ and 850 ℃ is respectively higher than 950 MPa, 650 MPa and 450MPa, and the yield strength of the alloy under three conditions after deformation is respectively not lower than 1050 MPa, 700 MPa and 480 MPa. In addition, the alloy has good corrosion resistance, and the alloy is in a smoke environment (N) at 800 DEG C2-15％CO2-3.5％O2-0.1％SO2) The weight gain of the corrosion is not more than 1.4mg/cm in 400 hours2。
Example 1
The structural stability of the alloy is controlled on the basis of greatly improving the content of Fe element in the alloy, and simultaneously, the content and proportion of corrosion resistant elements such as Al, Cr and the like are reasonably adjusted to obtain good corrosion resistance. The alloy components meet the following requirements in percentage by mass: cr: 20%, Fe: 15%, Co: 23%, Ti: 5.6%, Al: 3.0%, W: 3.0%, Mo: 3.0%, Si: 0.15%, Mn: 0.2%, C: 0.07%, B: 0.02%, Zr: 0.02% and the balance of Ni. Heating the alloy to 1050 ℃ at the speed of 10 ℃/min, preserving the heat for 0.5 hour, then continuously heating, carrying out homogenization treatment at 1180 ℃ for 24 hours, and then cooling in air. Heating the alloy to 70 ℃ above the gamma' dissolving temperature at the speed of 60 ℃/min, and keeping the temperature for 4 hours, and then cooling the alloy to room temperature in air; and then heating the alloy to be below the gamma 'dissolving temperature and keeping the temperature for 8 hours, then air-cooling, and finally heating to be below the gamma' dissolving temperature and keeping the temperature for 2 hours, and then air-cooling.
FIG. 1 is a photograph of the structure of example 1, which shows a typical dendrite structure in an as-cast state. In addition, a large volume fraction of eutectic regions exist at the grain boundaries without significant deleterious phase precipitation within the crystal. The performance test result proves that the alloy has excellent strength performance, and the yield strengths of the alloy after heat treatment at room temperature, 800 ℃ and 850 ℃ are 988MPa, 686MPa and 486MPa respectively. In addition, the alloy is subjected to flue gas corrosion at 800 ℃ for 500 hoursThe weight gain after the treatment is not more than 1.4mg/cm2。
Example 2
The structural stability of the alloy is controlled on the basis of greatly improving the content of Fe element in the alloy, and simultaneously, the content and proportion of corrosion resistant elements such as Al, Cr and the like are reasonably adjusted to obtain good corrosion resistance. The alloy components meet the following requirements in percentage by mass: cr: 20%, Fe: 15%, Co: 23%, Ti: 5.6%, Al: 3.0%, W: 3.0%, Mo: 3.0%, Si: 0.15%, Mn: 0.2%, C: 0.07%, B: 0.02%, Zr: 0.02% and the balance of Ni. Heating the alloy to 1050 ℃ at the speed of 10 ℃/min, preserving the heat for 0.5 hour, then continuously heating, carrying out homogenization treatment at 1180 ℃ for 24 hours, and then cooling in air.
And (3) carrying out high-temperature rolling at the temperature 100 ℃ above the gamma' dissolving temperature, wherein the deformation of each pass is 15%, and after the rolling is finished, returning the furnace and preserving the heat for 15min to finally obtain the alloy with the total deformation of 50%. In order to avoid the problems that the gamma' phase precipitation is promoted by overlarge temperature reduction amplitude before the alloy rolling process, an alloy ingot is cracked due to transverse shear stress in the rolling process and the like, the high-temperature hot rolling is carried out in a sheathing mode, and a sheathing material is a 304 stainless steel sheet with the thickness of 1.0 mm. Heating the alloy to 70 ℃ above the gamma' dissolving temperature at the speed of 60 ℃/min, and keeping the temperature for 4 hours, and then cooling the alloy to room temperature in air; and then heating the alloy to be below the gamma 'dissolving temperature and keeping the temperature for 8 hours, then air-cooling, and finally heating to be below the gamma' dissolving temperature and keeping the temperature for 2 hours, and then air-cooling.
FIG. 2 is a photograph showing the morphology of the intergranular eutectic region in example 2, and it can be seen that a large amount of fine acicular precipitates exist in the eutectic region, and M23C 6-type carbide with larger size exists at the interface between the eutectic region and the matrix. The performance test result proves that the alloy has excellent strength performance, and the yield strengths of the alloy after heat treatment at room temperature, 800 ℃ and 850 ℃ are 1070MPa, 716MPa and 501MPa respectively. In addition, the weight of the alloy after 500 hours of flue gas corrosion at 800 ℃ is not more than 1.3mg/cm2。
Example 3
According to mass percent, mixing Cr: 16%, Fe: 20%, Co: 23%, Ti: 4.5%, Al: 3.0%, W: 1.0%, Mo: 3.0%, Si: 0.5%, Mn: 0.2%, C: 0.04%, B: 0.03%, Zr: 0.01 percent, and the balance of Ni; heating to 1050 ℃ at the speed of 10 ℃/min, preserving heat for 0.5 hour, then continuously heating, homogenizing at 1160 ℃ for 60 hours, finally wrapping by adopting a 304 stainless steel sheet with the thickness of 0.5-1.0mm, carrying out high-temperature rolling at 50 ℃ above the gamma' dissolving temperature, wherein the deformation of each pass is 15%, returning to the furnace after the rolling of each pass is finished, preserving heat for 20 minutes, and the total deformation is not lower than 50%, and finally carrying out heat treatment, wherein the specific process is as follows: heating to the temperature higher than the gamma' dissolving temperature by the speed of 90 ℃/min and keeping the temperature for 5.0 hours within the range of 30 ℃, and then cooling to the room temperature in air; and then heating the alloy to the temperature of 350 ℃ below the gamma 'dissolving temperature, preserving heat for 3 hours, then air-cooling, and finally heating to the temperature of 200 ℃ below the gamma' dissolving temperature, preserving heat for 3 hours, and then air-cooling.
Example 4
According to mass percent, mixing Cr: 18%, Fe: 15%, Co: 15%, Ti: 5.6%, Al: 2.1%, W: 2.0%, Mo: 2.0%, Si: 0.1%, Mn: 0.5%, C: 0.07%, B: 0.02%, Zr: 0.03 percent, and the balance being Ni; heating to 950 ℃ at the speed of 15 ℃/min, preserving heat for 1 hour, continuing heating, homogenizing at 180 ℃ for 24 hours, finally wrapping by adopting a 304 stainless steel sheet with the thickness of 0.5-1.0mm, performing high-temperature rolling at 70 ℃ above the gamma' dissolving temperature, wherein the deformation of each pass is 12%, returning to the furnace after the completion of each pass of rolling, preserving heat for 15 minutes, and the total deformation is not less than 50%, and finally performing heat treatment, wherein the specific process comprises the following steps: heating to the temperature 50 ℃ above the gamma' dissolution temperature at the speed of 50 ℃/min, preserving the heat for 4.0 hours, and then cooling to room temperature; and then heating the alloy to the temperature of 320 ℃ below the gamma 'dissolving temperature, preserving heat for 5 hours, then air-cooling, finally heating to the temperature of 250 ℃ below the gamma' dissolving temperature, preserving heat for 1 hour, and then air-cooling.
Example 5
According to mass percent, mixing Cr: 20%, Fe: 17%, Co: 18%, Ti: 5%, Al: 2.5%, W: 3.0%, Mo: 1.0%, Mn: 0.1%, C: 0.05%, B: 0.01%, Zr: 0.02% and the balance of Ni; raising the temperature to 1000 ℃ at the speed of 20 ℃/min, preserving the heat for 0.7 hour, then continuing raising the temperature, homogenizing at 1150 ℃ for 72 hours, finally wrapping by adopting a 304 stainless steel sheet with the thickness of 0.5-1.0mm, performing high-temperature rolling at 100 ℃ above the gamma' dissolving temperature, wherein the deformation of each pass is 10%, returning the furnace after the completion of the rolling of each pass, preserving the heat for 10 minutes, and the total deformation is not less than 50%, and finally performing heat treatment, wherein the specific process comprises the following steps: heating to 70 ℃ above the gamma' dissolving temperature at the speed of 80 ℃/min, and keeping the temperature for 3.0 hours, and then cooling to room temperature; and then heating the alloy to be below the gamma 'dissolving temperature within 300 ℃ for 9 hours, then carrying out air cooling, and finally heating to be below the gamma' dissolving temperature within 220 ℃ for 2 hours, and then carrying out air cooling.
Comparative example 1
The alloy components meet the following requirements in percentage by mass: cr: 20%, Co: 23%, Ti: 5.6%, Al: 3.0%, W: 3.0%, Mo: 3.0%, Si: 0.15%, Mn: 0.2%, C: 0.07%, B: 0.02%, Zr: 0.02% and the balance of Ni. Heating the alloy to 1050 ℃ at the speed of 10 ℃/min, preserving the heat for 0.5 hour, then continuously heating, carrying out homogenization treatment at 1180 ℃ for 24 hours, and then cooling in air.
And (3) carrying out high-temperature rolling at the temperature 100 ℃ above the gamma' dissolving temperature, wherein the deformation of each pass is 15%, and after the rolling is finished, returning the furnace and preserving the heat for 15min to finally obtain the alloy with the total deformation of 50%. In order to avoid the problems that the gamma' phase precipitation is promoted by overlarge temperature reduction amplitude before the alloy rolling process, an alloy ingot is cracked due to transverse shear stress in the rolling process and the like, the high-temperature hot rolling is carried out in a sheathing mode, and a sheathing material is a 304 stainless steel sheet with the thickness of 1.0 mm. Heating the alloy to 70 ℃ above the gamma' dissolving temperature at the speed of 60 ℃/min, and keeping the temperature for 4 hours, and then cooling the alloy to room temperature in air; and then heating the alloy to be below the gamma 'dissolving temperature and keeping the temperature for 8 hours, then air-cooling, and finally heating to be below the gamma' dissolving temperature and keeping the temperature for 2 hours, and then air-cooling.
FIG. 3 is a photograph of the grain boundary morphology of comparative example 1, which shows that the grain boundary has no eutectic region when Fe element is not contained in the alloy, but a large amount of α -Cr with larger size is precipitated, thereby affecting the alloy performance.
The invention aims at advanced ultra-supercritical fireThe motor set is developed according to the requirements, and can meet the service performance requirements of high-temperature components such as a main steam pipe, a header and the like. The alloy components meet the following range requirements in percentage by mass: cr: 16-20%, Fe: 15-20%, Co: 15-23%, Ti: 4.5-5.6%, Al: 2.1-3.0%, W: 1.0-3.0%, Mo: 1.0-3.0%, Si: less than or equal to 0.5 percent, Mn: less than or equal to 0.5 percent, C: 0.04-0.07%, B: less than or equal to 0.03 percent, Zr: less than or equal to 0.03 percent, and the balance being Ni; homogenizing after smelting, hot rolling and finally heat treatment. The alloy of the invention consists of austenite and Ni in crystal3Al (gamma ') two-phase composition, wherein the volume fraction of gamma' is not less than 25%. The grain boundary is composed of M23C6 and gamma/gamma' eutectic region. The alloy has excellent strength, the tensile yield strength of the alloy in an as-cast state at room temperature, 800 ℃ and 850 ℃ is respectively higher than 950 MPa, 650 MPa and 450MPa, and the yield strength of the alloy under three conditions after deformation is respectively not lower than 1050 MPa, 700 MPa and 480 MPa. In addition, the alloy has good corrosion resistance, and the alloy is in a smoke environment (N) at 800 DEG C2-15％CO2-3.5％O2-0.1％SO2) The weight gain of the corrosion is not more than 1.4mg/cm in 400 hours2。
Claims (6)
1. A low-cost easy-processing iron-nickel-cobalt-based high-temperature alloy is characterized in that: comprises the following components in percentage by mass: cr: 16-20%, Fe: 15-20%, Co: 15-23%, Ti: 4.5-5.6%, Al: 2.1-3.0%, W: 1.0-3.0%, Mo: 1.0-3.0%, Si: less than or equal to 0.5 percent, Mn: less than or equal to 0.5 percent, C: 0.04-0.07%, B: less than or equal to 0.03 percent, Zr: less than or equal to 0.03 percent, and the balance being Ni.
2. A preparation method of a low-cost easy-processing iron-nickel-cobalt-based high-temperature alloy is characterized by comprising the following steps of: according to mass percent, mixing Cr: 16-20%, Fe: 15-20%, Co: 15-23%, Ti: 4.5-5.6%, Al: 2.1-3.0%, W: 1.0-3.0%, Mo: 1.0-3.0%, Si: less than or equal to 0.5 percent, Mn: less than or equal to 0.5 percent, C: 0.04-0.07%, B: less than or equal to 0.03 percent, Zr: less than or equal to 0.03 percent, and the balance being Ni; keeping the temperature at 1050 ℃ of 950-.
3. The method for preparing the low-cost easy-processing iron-nickel-cobalt-based high-temperature alloy according to claim 2, wherein the method comprises the following steps: the temperature is raised to 950 ℃ and 1050 ℃ at the speed of 10-20 ℃/min.
4. The method for preparing the low-cost easy-processing iron-nickel-cobalt-based high-temperature alloy according to claim 2, wherein the method comprises the following steps: and after each pass of rolling is finished, returning to the furnace and preserving heat for 10-20 min.
5. The method for preparing the low-cost easy-processing iron-nickel-cobalt-based high-temperature alloy according to claim 2, wherein the method comprises the following steps: the high-temperature hot rolling is carried out in a sheathing mode, and the sheathing material is a 304 stainless steel sheet with the thickness of 0.5-1.0 mm.
6. The method for preparing the low-cost easy-processing iron-nickel-cobalt-based high-temperature alloy according to claim 2, wherein the method comprises the following steps: the specific process of the heat treatment is as follows: heating to 30-70 deg.C above the gamma' dissolving temperature at a rate of 50-90 deg.C/min for 3.0-5.0 hr, and air cooling to room temperature; then heating the alloy to the temperature of 300-350 ℃ below the gamma 'dissolving temperature, then carrying out air cooling after the heat preservation is carried out for 3-9 hours, and finally heating to the temperature of 200-250 ℃ below the gamma' dissolving temperature, then carrying out air cooling after the heat preservation is carried out for 1-3 hours.
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